Re: [PATCH vhost 2/7] vdpa/mlx5: Split function into locked and unlocked variants

Eugenio Perez Martin
2023-12-01T11:47:27Z

On Fri, Dec 1, 2023 at 11:49 AM Dragos Tatulea <dtatulea@nvidia.com> wrote:
>
> mlx5_vdpa_destroy_mr contains more logic than _mlx5_vdpa_destroy_mr.
> There is no reason for this to be the case. All the logic can go into
> the unlocked variant.
>
> Using the unlocked version is needed in a follow-up patch. And it also
> makes it more consistent with mlx5_vdpa_create_mr.
>
> Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com>

Acked-by: Eugenio Pérez <eperezma@redhat.com>

> ---
> drivers/vdpa/mlx5/core/mr.c | 31 ++++++++++++++++---------------
> 1 file changed, 16 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/vdpa/mlx5/core/mr.c b/drivers/vdpa/mlx5/core/mr.c
> index 2197c46e563a..8c80d9e77935 100644
> --- a/drivers/vdpa/mlx5/core/mr.c
> +++ b/drivers/vdpa/mlx5/core/mr.c
> @@ -498,32 +498,32 @@ static void destroy_user_mr(struct mlx5_vdpa_dev *mvdev, struct mlx5_vdpa_mr *mr
>
> static void _mlx5_vdpa_destroy_mr(struct mlx5_vdpa_dev *mvdev, struct mlx5_vdpa_mr *mr)
> {
> + if (!mr)
> + return;
> +
> if (mr->user_mr)
> destroy_user_mr(mvdev, mr);
> else
> destroy_dma_mr(mvdev, mr);
>
> + for (int i = 0; i < MLX5_VDPA_NUM_AS; i++) {
> + if (mvdev->mr[i] == mr)
> + mvdev->mr[i] = NULL;
> + }
> +
> vhost_iotlb_free(mr->iotlb);
> +
> + kfree(mr);
> }
>
> void mlx5_vdpa_destroy_mr(struct mlx5_vdpa_dev *mvdev,
> struct mlx5_vdpa_mr *mr)
> {
> - if (!mr)
> - return;
> -
> mutex_lock(&mvdev->mr_mtx);
>
> _mlx5_vdpa_destroy_mr(mvdev, mr);
>
> - for (int i = 0; i < MLX5_VDPA_NUM_AS; i++) {
> - if (mvdev->mr[i] == mr)
> - mvdev->mr[i] = NULL;
> - }
> -
> mutex_unlock(&mvdev->mr_mtx);
> -
> - kfree(mr);
> }
>
> void mlx5_vdpa_update_mr(struct mlx5_vdpa_dev *mvdev,
> @@ -535,10 +535,7 @@ void mlx5_vdpa_update_mr(struct mlx5_vdpa_dev *mvdev,
> mutex_lock(&mvdev->mr_mtx);
>
> mvdev->mr[asid] = new_mr;
> - if (old_mr) {
> - _mlx5_vdpa_destroy_mr(mvdev, old_mr);
> - kfree(old_mr);
> - }
> + _mlx5_vdpa_destroy_mr(mvdev, old_mr);
>
> mutex_unlock(&mvdev->mr_mtx);
>
> @@ -546,8 +543,12 @@ void mlx5_vdpa_update_mr(struct mlx5_vdpa_dev *mvdev,
>
> void mlx5_vdpa_destroy_mr_resources(struct mlx5_vdpa_dev *mvdev)
> {
> + mutex_lock(&mvdev->mr_mtx);
> +
> for (int i = 0; i < MLX5_VDPA_NUM_AS; i++)
> - mlx5_vdpa_destroy_mr(mvdev, mvdev->mr[i]);
> + _mlx5_vdpa_destroy_mr(mvdev, mvdev->mr[i]);
> +
> + mutex_unlock(&mvdev->mr_mtx);
>
> prune_iotlb(mvdev->cvq.iotlb);
> }
> --
> 2.42.0
>